Электромагнитная совместимость электроустановок нетяговых потребителей и системы электроснабжения с высоковольтным питающим проводом

Abstract

A procedure for calculating switching overvoltages, including those that occur when lightning currents discharge in a power supply system’s contact system with a high-voltage power lead, is substantiated. It has been found that the floor-mounted signaling arrangements can be protected from switching overvoltages in the power supply system with a high-voltage power lead (HVPL PSS) by connecting the contact system supports with a long grounding conductor laid in the ground and not connected with the railway. An algorithm for simulating the spectral composition of zero sequence phase voltage components in overhead power lines with the insulated neutral with respect to ground in the case of their location in the HVPL PSS electromagnetic influence zone and the presence of a zero sequence voltage filter (ZSVF). If the studied system does not contain a ZSVF, this results in a multifold increase of the power line zero sequence voltages, imbalance of the phase voltages, and the occurrence of interference both at the line beginning and end points. The use of filters made it possible to smooth and flatten the spectral composition of voltage and to minimize the effect of resonance phenomena at high frequencies.